Exercise: Communication Systems

Questions for: Communication Systems

Foster Seeley discriminator uses a
A:
single tuned circuit
B:
double tuned circuit with primary and secondary tuned to the same frequency
C:
double tuned circuit with primary and secondary tuned to the different frequency
D:
none of the above
Answer: A
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To avoid objectionable noise in a microwave TV link, the SNR should be about
A:
50 or more
B:
10 or more
C:
25 or more
D:
200 or more
Answer: C
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During playback the take up reel is
A:
in clockwise motion
B:
in anticlockwise motion
C:
either clockwise or anticlockwise motion
D:
none of the above
Answer: B
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Assertion (A): Radio transmission is by sky waves

Reason (R): Waves having frequencies higher than 30 MHz penetrate the atmosphere and do not return to earth.

A:
Both A and R are correct and R is correct explanation of A
B:
Both A and R are correct but R is not correct explanation of A
C:
A is correct but R is wrong
D:
A is wrong but R is correct
Answer: B
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Each of the following statements regarding frequency modulation is true except
A:
amplitude of the modulated wave remains the same as that of carrier wave
B:
the amount of variation of deviation from the original carrier frequency is determined by the frequency of the modulating signal
C:
the rate at which the frequency of modulated wave varies is determined by the frequency of the modulating signal
D:
frequency of modulated wave increases as the signal voltage increases and vice-versa
Answer: B
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